17.6.2.3 Impact 3: Changes to the historic seascape character. 195. The presence of East Anglia THREE would result in a change to the current historic seascape character of the area to include a character associated with offshore renewables.
17.6.3 Potential Impacts during Decommissioning 196. As a result of embedded mitigation, direct impacts to known archaeological receptors would not occur. Unavoidable direct impacts to potential archaeological receptors may occur at any point at which decommissioning activities disturb the sea floor.
197. Increased deterioration of, or protection to, known and potential receptors may occur as a result of changes to the hydrodynamic and sedimentary regimes associated with decommissioning activities.
198. Decommissioning activities may also change the character of the historic seascape as a result of the removal of windfarm components and ancillary structures.
17.6.3.1 Impact 1: Direct Impacts 199. Activities undertaken within the East Anglia THREE site as part of decommissioning works have the potential to directly impact potential archaeological receptors on or under the sea bed resulting in their loss or to disturb relationships between receptors and their wider surrounding.
200. Impacts resulting in these potential effects during decommissioning phase of the windfarm include:
Removal of cables, foundations, wind turbines, collector stations and converter stations and associated scour protection; and
Use of jack-up crane vessel and / or anchors of other vessels deployed during decommissioning.
201. The magnitude of effect of direct impacts to archaeological receptors from the removal of foundations, scours protection or cables during decommissioning would be negligible if provision is made for methods of removal which minimise further impact to the wider area. It is reasonable to assume that, as a result of construction activities, any potential damage would have already occurred.
202. The magnitude of the effect of new and discrete impacts to potential sites, for example from vessel anchors, would be high. Each impact may affect archaeological material which has not been subject to any damage in the construction phase.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 17 Offshore Archaeology Page 93
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